A highly dangerous - and huge - jellyfish has been spotted on a beach in Co Down.

The Lion’s Mane jellyfish have been washing up in numbers along Ireland’s east coast in recent days.

And this one can be particularly nasty...

The diameter of the jellyfish body - or bell - can measure about 14 feet.

The hundreds of t entacles can reach lengths of up to 180 feet.

And even though their lifespan is only a year, the biggest ones can weight more than a tonne.

Co Down woman, Janette Campbell, 46, was curious about the sight while walking the beach at Kilkeel.

Janette Campbell nearly stepped on the dangerous jellyfish

She posted a picture of the jellyfish on Facebook and asked pals if they knew what it was, telling them she had nearly stepped on it.

Janette says the smaller jellyfish are a more normal site on the Kilkeel beach she loves

The sting from the Lion's Mane jellyfish is much more potent than those of other species found in Irish waters.

For people who are allergic, coming in contact with this whopper can potentially trigger severe anaphylactic shock.

And the jelly giant is not even safe days after it is dead.

Its hundreds of tentacles can still sting days after they have washed up and died.

They are easy to spot on land, ranging in colour from dark red to bright orange and yellow and is the largest jellyfish in the Atlantic Ocean and in the water, it is often bioluminescent, emitting its own light.